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Статья
2019

The Effect of the Nature of Cation on Transport Properties of Bis(trifluoromethylsulfonyl)imide Ionic Liquids


E. P. Grishina E. P. Grishina , N. O. Kudryakova N. O. Kudryakova , L. M. Ramenskaya L. M. Ramenskaya , Yu. A. Fadeeva Yu. A. Fadeeva
Российский электрохимический журнал
https://doi.org/10.1134/S1023193519100057
Abstract / Full Text

The methods of viscosimetry, conductometry, densimetry, and differential scanning calorimetry are used for studying the physicochemical properties of cations (1-butyl-3-methylimidazolium [BuMeIm]+, N-butylmethylpyrrolidinium [BuMePyrr]+, and methytrioctylammonium [MeOc3Am]+) and their effect on the transport properties of bis(trifluoromethylsulfonyl)imide ionic liquids (IL). It is shown that ILs formed by cyclic amines ([BuMeIm]+ and [BuMePyrr]+) as the cations demonstrate the close values and temperature dependences of viscosity and conductivity. The cation [MeOc3Am]+ predetermines the difference in the IL structure and, thus, a substantial difference in the transport properties of the melt. For salts [BuMeIm][Tf2N], [BuMePyrr][Tf2N], and [MeOc3Am][Tf2N] at 293 К, the following transport characteristics are observed: viscosity 57.7, 88.1, and 726.5 mPa s; specific conductivity 0.376, 0.252, and 0.005 S m–1; activation energy of conductivity 21, 21, and 35 kJ mol–1; degree of “ionicity” 0.92, 0.94, and 1.00, respectively. Using the equation of Vogel–Fulcher–Tammann and based on the temperature dependences of specific conductivity and viscosity, the ideal glass transition temperatures are calculated for liquids under study. In the positive temperature range, a linear correlation is observed between the conductivity and the cation volume in these ionic liquids.

Author information
  • Krestov Institute of Solution Chemistry, Russian Academy of Sciences, 153045, Ivanovo, Russia

    E. P. Grishina, N. O. Kudryakova, L. M. Ramenskaya & Yu. A. Fadeeva

  • Ivanovo State University of Chemistry and Technology, 153000, Ivanovo, Russia

    E. P. Grishina

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